Home Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

OK to use a larger value fuse in an outboard power supply?

This kind of ties in to the "More on Fuses" post below... I recently acquired an outboard power supply for my Squeezebox Duet that uses a 1 amp / 250V / 20mm / slow-blow ceramic fuse. I have a HiFi Tuning fuse on hand that I'd like to try out to see if it improves the sound. The fuse isn't marked but I'm pretty sure it is a 3.15 amp slow blow.

I've read that ceramic fuses are spec'd because the sand inside can absorb current inrush that would otherwise "flash" and burn out a glass fuse of the same value. I've also been told that HiFi Tuning fuses can blow upon current inrush and in some cases a larger value fuse should be used.

Is increasing the fuse size from 1A to 3.15A large enough that I am putting the power supply at risk or even something that could cause a fire? I live in a newer home with very stable power and have never had a problem with fuses blowing on any of my components.

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Topic - OK to use a larger value fuse in an outboard power supply? - Dynamite Ham 15:23:00 05/17/17 (8)


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